What is the wavelength in nanometers of light with a frequency of 3.75 x 10^14s^-1?

what is the wavelength in meters and nanometers of light with an energy of 2.25 x 10^-18 joule?

with both of these.

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d